# A047118 (b-file synthesized from sequence entry)
0 1
1 4
2 14
3 53
4 195
5 711
6 2662
7 9973
8 37367
9 141472
10 537422
11 2045224
12 7821958
13 30001955
14 115296650
15 444336395
16 1716137440
17 6639137474
18 25732460158
19 99897347527
20 388339939659
21 1511670332538
22 5891647475819
23 22987227251180